Structurally, a refrigerator generally includes a box, a refrigeration system, and an electrical system.

Cooling System

The basic function of the refrigerator is to refrigerate and keep the inside of the box at an appropriate low temperature. The refrigeration system generally consists of four basic components: compressor, condenser, capillary or thermal expansion valve, and evaporator. Refrigerant is a liquid that can boil at low temperature at low pressure. It absorbs heat when it boils. The refrigerant circulates continuously in the refrigeration system. The compressor increases the gas pressure of the refrigerant, resulting in liquefaction conditions. When passing through the condenser, it condenses and liquefies and releases heat. , and then reduce the pressure and temperature when passing through the capillary, and then boil and vaporize to absorb heat when passing through the evaporator. In addition, the use of refrigeration diodes is now developed. There is no complicated mechanical device, but the efficiency is poor, and it is used in small refrigerators.

Early refrigerators mostly used R-12 refrigerant (ie, difluorodichloromethane), because it will destroy the ozone layer of the atmosphere, and now use R600a/R134a/R404 and other refrigerants instead.

In addition, due to the inevitable existence of some moisture and impurities in the system, a drying filter is generally installed at the inlet end of the capillary.

Electrical System

Refrigerators use electricity as the main energy source, rely on electric motors to drive compressors or use refrigeration diodes, and are generally equipped with relay protectors and thermostats.

According to different starting methods, refrigerator motors using compressors can be divided into resistance split-phase starting type, capacitor starting type and capacitor starting capacitor running type. The motor of the fully hermetic compressor is installed inside the refrigeration system, which is in contact with the refrigerant and refrigerating machine oil for a long time, and bears pressure and high temperature, so it must be resistant to refrigerant and refrigerating oil, stable electrical performance, high temperature resistance, vibration and shock resistance , Have a larger starting torque and keep clean without moisture and other requirements.

box

The box body is composed of structural materials and thermal insulation materials, forming a space to store food and preventing heat transfer from inside and outside. The box generally includes an outer box, an inner tank, and a thermal insulation layer. The inner liner (lining) of the refrigerator is generally made of ABS or HIPS sheet by vacuum forming, with a thickness of less than 1 mm, white and smooth. Polyurethane foam is widely used as thermal insulation material, which has excellent thermal insulation performance and little change in thermal conductivity after long-term use.

Some have separate freezer or refrigerator compartments, while others have both. Now some refrigerators are even divided into four compartments to store various kinds of food:

Freezing: −18 °C (0 °F)

Meat: 0 °C (32 °F)

Refrigeration: 4 °C (39 °F)

Vegetables: 10 °C (50 °F)

The capacity of a refrigerator is measured in liters or cubic feet. A typical refrigerator has 100 liters of freezer capacity and 140 liters of ice storage.

In Hong Kong colloquialism, the whole refrigerator is generally called "refrigerator", and the freezer compartment is called "ice box", while the refrigerator compartment is generally not called another name. If you want to distinguish between the two, it is usually called "ice tray"/"refrigerator", or "upper compartment"/"lower compartment" (from the traditional household refrigerator, the freezer compartment is mostly located above, and the refrigerator compartment is located below).
Ningbo Kestar Refrigeration Equipment Co., Ltd. is very good at refrigerator product design

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